Movable vibration measuring device for hydraulic engineering plant structure

Abstract

The utility model belongs to the technical field of hydraulic engineering plant structure vibration monitoring, and particularly provides a hydraulic engineering plant structure movable vibration measuring device which comprises a carrying vehicle body, a rotary vibration isolation mechanism is arranged on the carrying vehicle body, a support is arranged on the rotary vibration isolation mechanism, and a laser Doppler scanning vibration measuring instrument is installed on the support. The rotary vibration isolation mechanism comprises a lower shell and an upper shell, an elastic supporting body is arranged between the lower shell and the upper shell, a rotary motor is arranged on the upper shell, the output end of the rotary motor is connected with a rotary platform, and the rotary platform is connected with the support. According to the device, comprehensive coverage of plant structure vibration monitoring is realized, and interference of ground vibration noise on vibration measurement can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to water conservancy project plant structure vibration monitoring technical field especially relates to a water conservancy project plant structure movable vibration measuring device. BACKGROUND

[0002] Water conservancy project plant such as hydropower station, water pumping station, water gate plant etc. produces sustained dynamic load in the operation process Unit system, if the structure design is improper or equipment installation is bad, easy to cause larger structure resonance, lead to structure crack in shorter operation period;Under the long-term dynamic load, concrete material also can occur material fatigue failure under high level cyclic stress. Vibration monitoring is an important link of water conservancy project plant safety monitoring, through the vibration sensor distribution on the plant structure to obtain structure vibration information, then analyzes structure vibration response characteristics to find structure vibration safety hidden danger, has important significance to guarantee plant structure long -term safe operation.

[0003] In engineering application, water conservancy project plant structure vibration monitoring often uses unidirectional or three -dimensional accelerometer as sensor, fixes it on the plant structure surface, can continuously, stably gather structure vibration information. But because plant structure vibration hidden danger position is unknown, and the accelerometer cost is higher, through the limited number of sensors cannot realize the vibration monitoring of the whole plant structure. With the improvement of sensor technology level, at present, the distributed vibration measurement technology represented by optical fiber vibration sensing (CN206695898U) and multipoint laser doppler scanning (CN203929213U) has been developed, and has been well applied in related engineering, such as invention (CN108844963A) through distributed optical fiber vibration measurement, on -line monitoring of the corrosion defect of large storage tank bottom plate;Invention (CN104535656A) uses doppler laser scanning vibration, quickly and accurately locates the impact damage of large spacecraft structure. For water conservancy project plant, its internal structure is complex, and the monitoring position is more, and the wide range of fiber layout is easy to interfere with the normal operation of the plant;Single doppler laser scanning vibration equipment can only realize the vibration measurement of a certain range of structure, and its accuracy is easy to be affected by the noise of working environment. Therefore, the above technical means is still difficult to effectively realize the comprehensive coverage of plant structure vibration monitoring, therefore, another feasible scheme needs to be sought. SUMMARY

[0004] The utility model wants to solve the technical problem to provide a water conservancy project plant structure movable vibration measuring device, realizes the comprehensive coverage of plant structure vibration monitoring, and can reduce the interference of ground vibration noise to vibration.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a mobile vibration measuring device for the structure of a water conservancy project plant, including a carrier body, a rotating vibration isolation mechanism is provided on the carrier body, a bracket is provided on the rotating vibration isolation mechanism, a laser Doppler scanning vibrometer is installed on the bracket, the rotating vibration isolation mechanism includes a lower shell and an upper shell, an elastic support body is provided between the lower shell and the upper shell, a rotary motor is provided on the upper shell, the output end of the rotary motor is connected to the rotary platform, and the rotary platform is connected to the bracket.

[0006] In a preferred solution, the elastic support body is a rubber spring.

[0007] In a preferred solution, a lower limit cylinder is provided on the upper side of the lower shell, and an upper limit cylinder is provided on the lower side of the upper shell, and the upper limit cylinder is buckled on the outer side of the lower limit cylinder.

[0008] In a preferred solution, a rotating shaft is provided at the upper end of the bracket, the rotating shaft is connected to the frame of the laser Doppler scanning vibrometer, and the rotating shaft is driven by a driving motor.

[0009] In a preferred embodiment, the bracket is a "U"-shaped structure, with two sets of rotating shafts provided at the upper end of the bracket. The rotating shafts are rotatably mounted on the bracket, the drive motor is connected to one set of the rotating shafts, and the laser Doppler scanning vibrometer is arranged between the two sets of rotating shafts.

[0010] In a preferred solution, a magnetic iron block is provided on the frame of the laser Doppler scanning vibrometer corresponding to the rotating shaft, and an electromagnet for attracting the magnetic iron block is provided at the end of the rotating shaft.

[0011] The utility model provides a mobile vibration measuring device for water conservancy project plant structure, which has the following beneficial effects:

[0012] 1. By setting up a transport vehicle, mobile vibration measurement of the plant structure is realized, which fully covers the vibration monitoring of the water conservancy project plant structure and reduces the economic cost of vibration monitoring of the entire plant structure.

[0013] 2. By setting up a rotating vibration isolation mechanism, not only can the horizontal scanning coverage of the monitoring point be achieved, but also the interference of ground environmental vibration on the laser Doppler scanning vibrometer can be reduced.

[0014] 3. By optimizing the bracket structure, the angle adjustment of the laser Doppler scanning vibrometer in the vertical plane can be achieved, thereby improving the vibration measurement coverage range.

[0015] 4. The use of non-contact measurement technology greatly reduces the interference of measurement work on the normal operation of the plant, and improves the automation and intelligence level of structural vibration measurement of water conservancy project plant buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 It is the structural schematic view of the utility model;

[0018] Figure 2 It is the structural schematic view of the carrying vehicle body;

[0019] Figure 3 It is the mounting structure schematic view of the support;

[0020] Figure 4 It is the structural schematic view of the rotating vibration isolation mechanism;

[0021] Figure 5 It is the mounting structure schematic view of the magnetic iron block;

[0022] Figure 6 It is the structural schematic view of the utility model in use state;

[0023] In the drawing: carrying vehicle body 1, rotating vibration isolation mechanism 2, lower shell 210, lower limiting cylinder 211, upper shell 220, upper limiting cylinder 221, elastic support 230, slewing motor 240, slewing platform 250, support 3, rotating shaft 310, driving motor 320, electromagnet 330, laser Doppler scanning vibration meter 4, magnetic iron block 410. DETAILED DESCRIPTION

[0024] Example 1:

[0025] As shown in Figures 1-4 , a movable vibration measuring device for water conservancy plant structure, including carrying vehicle body 1, carrying vehicle body 1 is the existing unmanned vehicle, including the frame, omnidirectional wheel, lithium battery pack and visual obstacle avoidance component, can automatically walk, select the existing unmanned vehicle on the market, for example, can select the remote control electric rubber wheel car manufactured by Xinlide. The carrying vehicle body 1 is provided with a rotating vibration isolation mechanism 2, the rotating vibration isolation mechanism 2 is provided with a support 3, and the laser Doppler scanning vibration meter 4 is installed on the support 3.

[0026] As shown in Figure 4As shown, the rotating vibration isolation mechanism 2 comprises a lower shell 210 and an upper shell 220, and an elastic support body 230 is arranged between the lower shell 210 and the upper shell 220, the elastic support body 230 serves as a damping buffer, in this embodiment, the elastic support body 230 is a rubber spring, which can also be replaced by other rubber damping blocks, and the elastic support body 230 can reduce the interference of ground environmental vibration on the laser Doppler scanning vibration meter 4. The upper shell 220 is provided with a rotary motor 240, the output end of the rotary motor 240 is connected with a rotating platform 250, and the rotating platform 250 is connected with the support 3. The rotating platform 250 and the support 3 are driven to rotate synchronously by the rotary motor 240, so that the laser Doppler scanning vibration meter 4 rotates in the horizontal plane, and vibration measurement at different positions is facilitated, and the coverage range is improved.

[0027] In specific use, the upper shell 220 is provided with a mounting groove matched with the rotary motor 240 at the top, and the rotating platform 250 is provided with a sliding wheel moving along the top of the mounting groove, which is beneficial to the rotary support of the rotating platform 250 and does not affect the rotation of the rotating platform 250.

[0028] Preferably, the lower shell 210 is provided with a lower limiting cylinder 211 on the upper side, and the lower shell 210 and the lower limiting cylinder 211 can be arranged as an integral structure, and the upper shell 220 is provided with an upper limiting cylinder 221 on the lower side, and the upper limiting cylinder 221 is buckled outside the lower limiting cylinder 211, and the upper shell 220 is limited and positioned by cooperation between the upper limiting cylinder 221 and the lower limiting cylinder 211, so as to prevent it from moving left and right.

[0029] In this embodiment, the size of the carrier body 1 of the device is 50cm*40cm*12cm, the diameter of the omni-directional wheel is 15cm, the width is 5cm, the advancing speed is 1-50cm / s, the lithium battery pack of the carrier body 1 is arranged at the rear of the vehicle body, the voltage is 48V, the capacity is 12A·h, a set of visual obstacle avoidance assembly is arranged on the front, rear, left and right sides of the carrier body, the obstacle warning distance is 15cm, the effective vibration isolation frequency range of the rotating vibration isolation mechanism is 0.5-1000Hz, the vibration isolation gain is not less than -30dB, the height of the support 3 is 25cm, and the horizontal rotation range is ±60°. The effective working distance of the laser Doppler scanning vibration meter 4 is 0.125m-50m, the scanning point number is 1-512*512, the effective range of vibration speed is ±30m / s, and the speed resolution is higher than 0.01μm / s / Hz bandwidth.

[0030] The data acquisition device and the control device are arranged in the middle of the carrying vehicle body 1, the laser Doppler scanning vibration meter 4 is sequentially connected with the data acquisition device and the control device, the data acquisition device is 18cm*20cm*15cm in size, the sampling frequency is 1Hz-10kHz, the data storage capacity is 1TB, and the control device is 18cm*15cm*25cm in size.

[0031] The main working process of the device is as follows:

[0032] 1) The measurement personnel manually plans the travel route of the unmanned vehicle according to the actual scene inside the water conservancy project building, and sets the observation parameters of each observation object, including the scanning point array size, the sampling time of a single point, the travel speed, etc., and inputs the measurement scheme into the control device.

[0033] 2) The device automatically travels along the preset path, stops at the observation position, as shown in Figure 6 , the laser Doppler scanning vibration meter 4 faces the observation object, and performs laser point array scanning on the structure according to the preset observation parameters and saves the vibration data.

[0034] 3) Repeat step 2), complete the vibration observation of each observation position in turn, so as to obtain the distributed vibration data of the whole structure of the building.

[0035] Embodiment 2:

[0036] Different from embodiment 1, as shown in Figure 3 and 5 , the upper end of the support 3 is provided with a rotating shaft 310, the rotating shaft 310 is connected with the frame of the laser Doppler scanning vibration meter 4, and the rotating shaft 310 is driven by a driving motor 320.

[0037] Specifically, the support 3 is a "U" shaped structure, the upper end of the support 3 is provided with two groups of rotating shafts 310, the rotating shafts 310 are rotatably installed on the support 3, the driving motor 320 is connected with one of the rotating shafts 310, the laser Doppler scanning vibration meter 4 is arranged between the two groups of rotating shafts 310, and the frame of the laser Doppler scanning vibration meter 4 can be fixedly connected with the rotating shaft 310.

[0038] Through the driving of the driving motor 320, the rotation of the laser Doppler scanning vibration meter 4 in the vertical plane is realized, so that the scanning angle thereof can be adjusted conveniently, and the inclination angle of the laser Doppler scanning vibration meter 4 is ±45°.

[0039] In the embodiment, the magnetic iron block 410 is arranged on the corresponding rotating shaft 310 of the frame of the laser Doppler scanning vibrometer 4, the end of the rotating shaft 310 is provided with the electromagnet 330 for adsorbing the magnetic iron block 410, the magnetic iron block 410 is adsorbed by electrifying the electromagnet 330, thereby realizing the adsorption and fixation of the laser Doppler scanning vibrometer 4 arranged between the two groups of rotating shafts 310, and facilitating the installation of the laser Doppler scanning vibrometer 4.

[0040] The above-mentioned embodiments are only preferred technical solutions of the present application, and should not be regarded as limitations of the present application. The embodiments in the application and the features in the embodiments can be combined with each other as long as they do not conflict. The protection scope of the present application should be based on the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features recorded in the claims. That is, the equivalent replacement improvements within the scope are also within the protection scope of the present application.

Claims

1. A mobile vibration measuring device for a hydraulic engineering plant structure, comprising a carrier body (1), characterized in that: The carrier body (1) is provided with a rotating vibration isolation mechanism (2), a bracket (3) is provided on the rotating vibration isolation mechanism (2), a laser Doppler scanning vibrometer (4) is mounted on the bracket (3), the rotating vibration isolation mechanism (2) comprises a lower shell (210) and an upper shell (220), an elastic support body (230) is provided between the lower shell (210) and the upper shell (220), a rotary motor (240) is provided on the upper shell (220), an output end of the rotary motor (240) is connected to a rotary platform (250), and the rotary platform (250) is connected to the bracket (3).

2. The mobile vibration measuring device for water conservancy project plant structure according to claim 1, characterized in that: The elastic support body (230) is a rubber spring.

3. The mobile vibration measuring device for hydraulic engineering plant structure according to claim 1, characterized in that: A lower limit cylinder (211) is provided on the upper side of the lower shell (210), and an upper limit cylinder (221) is provided on the lower side of the upper shell (220). The upper limit cylinder (221) is buckled onto the outer side of the lower limit cylinder (211).

4. The mobile vibration measuring device for water conservancy project plant structure according to claim 1, characterized in that: A rotating shaft (310) is provided at the upper end of the bracket (3); the rotating shaft (310) is connected to a frame of the laser Doppler scanning vibrometer (4); and the rotating shaft (310) is driven by a driving motor (320).

5. The mobile vibration measuring device for hydraulic engineering plant structure according to claim 4, characterized in that: The bracket (3) is a "U"-shaped structure. Two sets of rotating shafts (310) are provided at the upper end of the bracket (3). The rotating shafts (310) are rotatably mounted on the bracket (3). The drive motor (320) is connected to one set of the rotating shafts (310). The laser Doppler scanning vibrometer (4) is arranged between the two sets of rotating shafts (310).

6. The mobile vibration measuring device for hydraulic engineering plant structure according to claim 5, characterized in that: A magnetic iron block (410) is provided on the frame of the laser Doppler scanning vibrometer (4) corresponding to the rotating shaft (310), and an electromagnet (330) for adsorbing the magnetic iron block (410) is provided at the end of the rotating shaft (310).

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